Current-regulator for electric transformers.



N0. 693,841. Patented Feb. 25, I902.

F. R. M. CUTCHEUN. CURRENT BEGULATO R FORELEGTBIG TRANSFORMERS.

(Appliation and Oct. 12, 1901. 2 Sheets-Shed I.

(No ModpL) Patentedfeb. 25, I902.

No. 693.840. k

F. R. M. CU TCHE ON. l CURRENT REGULATOR FDR ELECTRIC TRANSFURMERS.

2 Sheets-Sheet 2.

(Application filed Oct. 12, 1901.)

(No Model.)

- UNITED. STATES PATENT QFFICE.

4 FREDERICK a. M. CUTOHEON, or sr. PAUL, MINNESOTA.

CURRENT-REGULATOR FOR ELECTRIC TRANSFORMERS.

SPECIFICATEGN formingpart of Letters Patent No. 693,841, dated February 25, 1902. Application filed October 12, 1901. Serial No. 78,419- (No model.)

clare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art'to which it appertains to make and use the same.

My present invention has for its especial object to provide an improved amperage or current regulator for series-arc-lamp systems; and to the above ends the invention consistsofthe novel devices and combinations of devices hereinafter described, and defined in the 1 claims.

The invention is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout theseveral views.

Figure 1 is a View, principally in vertical section, showing an alternating transformer equipped with my improved regulator. Fig. 2 is a horizontal section on the line 00 m of Fig. 1, and Fig. 3 is a diagram .illustrating the manner of connecting the transformer to the secondary or arc-light circuit. v

The numeral 1 indicates 'a' U-shaped laminated iron core, the same, as shown, being supported by an insulating-base 2 and having its prongs connected by a suitable insulating-plate, such as a marble slab 8.

The primary coil 4 is wound on the yoke of I the core 1 and, as shown, extends to bindingposts 5. The primary leads 6 are connected one to each of the binding-posts 5.

The secondary coil 7 is wound on both prongs of the core 1. In the best form of the device this secondary coil is wound in sections, which are spaced apart and connected in series, as best shown in Fig. 1. As shown, the ends of the secondary coil 7 connect to binding-posts 8 on the slab or plate 3. The

leads 9 of the secondary circuit connect one to each of the binding-posts 8.

In the secondary circuit 9 is a series of arclamps 10, adapted to be connected in series or to be cut out of action by the ordinary or any suitable switches 11.

A soft-iron bar or armature 12 works adjustably in the field of the secondary coil 7.

The said armature is conveniently guided by a pair of brass rods 13, secured at their upper ends to the slab 3 and at their lower ends to a plate 14, suitably held between the prongs ofthecorel. f

The core 12 is adapted to be adjusted and' to be held where set by suitable devices such, for instance, as illustrated in'the-drawings.

16, secured on the slab 3.

17 indicates a cord or flexible band which works through a suitable slot 18 in the slab 3 and the lower endof which is connected to the armature or bar 12, while the upper end thereof is secured to the sheave 15. The sheave isadapted to be moved by a hand piece or crank 19, and it is adapted to be set 20, which is adapted to be inserted through any one of five holes 2 in said sheave and intoa suitable seat in the bearing-bracket,1t5.

The device illustrated in the drawings is circuit; but it'will of course be understood be increased to meet the requirements of operative systems wherein a very large number of lam psusually about fiftyare connected in series and in common circuit. I

For the purposes of illustration we will assume that each arc-lamp will require seventyfour volts and seven amperes and that each section of the secondary coil '7 is capable of inducing a current of thirty-seven volts and seven amperes. Under these conditions since ondary coil are out into and out of action in pairs by the armature 12 it'follows that there should be at least as many pairs of coil-sections in the secondary as there are lamps in the secondary circuit. It also follows that the said armature 12 should be so adjusted as to cut into action below the same as many pairs of coil-sections as there are secondary circuit. For instance it but two lamps are thrown into action the armature should be adjusted as shown in Fig. 1. When thus adjusted, the said armature short-circuits the magnetic field above the two lower pairsof coil-sections. The two pairs of coils 15 indicates a sheave mounted in a bearing shown as designed for a five-light. secondary the horizontally oppositesections of the sec-.

lamps thrown into action or connected in the.

in any one of five positions by means of a pin that in practice the capacity of the device will thus thrown into action will produce a current of one hundred and forty-eight volts and seven amperes, which is the current desired to run two arc-lamps in series.

If five lamps are thrown into action or connected inseries in the secondary circuit, the armature 12 should be adjusted to the position indicated by dotted lines in Fig. 1, in which position the five pairs of coil-sections will produce a current of three hundred and seventy volts and seven amperes, whichis the current desired to run five lamps connected in series. As is evident, by properly adjusting the armature the voltage or potential may be changed at will,whi1e the amperage is maintained constant.

The device is of course capable of many modifications within the scope of my invention. WhileI consider the peculiarly-won nd secondary coil as novel and desire to claim the same, it would be within the scope of my invention to wind the secondary coil continuously or without dividing the same into sections. For some work it might be possible to use what I have described as the secondary coil for the primary coil and to use what is herein illustrated as the primary coil as the secondary coil. It Willalso be understood that this device is not limited to use in connection with arc-lamp systems, but is capable of general use wherever a device of this character may be found serviceable.

What I claim, andldesire to secure by Letters Patent of the United States, is as follows:

1. The combination with the primary and secondary of an electric transformer, of an adjustable armature or bar arranged to va riably short-circuit the magnetic field and to cut into and out of action more or less of the component parts of said secondary coil, substantially as described.

2. In an electric transformer, the combination with a U-shaped core, of a primary coil wound on the yoke of said core, a secondary coil Wound on the prongs of said core, and an adjustable armature or bar working in the field of said secondary coil and serving to magnetically short-circuit the field of the secondary coil, and, by adjustment, to vary the strength of the said secondary coil, substantially as described.

3. In an electric transformer, the combination with a core, of a primary and secondary coil wound thereon, said secondary being formed by spaced sections, and an adjustable armature or bar working in the field of said primary coil and adapted to magnetically short-circuit the field of the primarycoil and cut into and out of action more or less of the sections of said secondary, substantially as described.

4. In an electric transformer the combination with a U-shaped core, of a primary coil wound on the yoke thereof, a secondary coil wound in spaced sections on the prongs of said core, the sections on the two prongs being located in transversely opposite pairs, and an armature or bar working adjustably in the -magnetic field of said secondary coil, for magnetically sliort-circuiting the said field, and adapted by adjustment, to cut into and out of action more or less of the said coil-sections, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

FREDERICK R. M. GUTCl-IEON. Witnesses:

ELIZABETH H. KELEHER, F. D. MERCHANT. 

